Net Operating Income Calculator accuracy and testing

Formula source

• NOI = gross scheduled income + other income - vacancy loss - operating expenses. Effective gross income = gross scheduled income + other income - vacancy loss.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• Debt service, principal paydown, depreciation, income taxes, sale costs, and investor-level tax items are excluded from NOI.
• All income and expense values are annual user-entered assumptions.
• All rents, expenses, rates, debt service, costs, appreciation, reserves, and investment amounts are entered by the user.
• Calculations run locally in your browser and are not stored by Calwarden.
• Results are estimates for planning and comparison only, not financial, tax, legal, lending, appraisal, or investment advice.

Unit handling

• Gross Scheduled Income accepts values in $/yr.
• Other Income accepts values in $/yr.
• Vacancy Loss accepts values in $/yr.
• Operating Expenses accepts values in $/yr.
• Net Operating Income is displayed as currency.
• Effective Gross Income is displayed as currency.
• Expense Ratio is displayed as a percentage.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Percent outputs are displayed with two decimal places.
• Input precision follows configured step values where provided.

Version history

Change log